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Unfortunately, the WebUIReuseInSubframe test is running into issues with
the memory allocator returning separate instances of WebUI objects at
the exact same memory address. This means that even though we have
different instances of the object, which is what the test aims to assert
it isn't possible to use pointer inequality as the assertion.
I've modified the test to use the RenderFrameHost global routing id
since one cannot have the same WebUI instance be owned by more than
one RenderFrameHost instance.

Bug: 713313, 1002276
Change-Id: Iea036b5cd10962c75f86a5b25d9f655012caf686
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1886292Reviewed-by: Aaron Colwell <acolwell@chromium.org>
Commit-Queue: Nasko Oskov <nasko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710440}